145321717691 has 2 divisors, whose sum is σ = 145321717692. Its totient is φ = 145321717690.

The previous prime is 145321717591. The next prime is 145321717777. The reversal of 145321717691 is 196717123541.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145321717691 is a prime.

It is a super-2 number, since 2×145321717691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145321717591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72660858845 + 72660858846.

It is an arithmetic number, because the mean of its divisors is an integer number (72660858846).

Almost surely, 2^145321717691 is an apocalyptic number.

145321717691 is a deficient number, since it is larger than the sum of its proper divisors (1).

145321717691 is an equidigital number, since it uses as much as digits as its factorization.

145321717691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 47.

The spelling of 145321717691 in words is "one hundred forty-five billion, three hundred twenty-one million, seven hundred seventeen thousand, six hundred ninety-one".